Article of footwear including a monofilament knit element with a fusible strand

• US 8,997,530 B1
• Filed: 05/07/2014
• Issued: 04/07/2015
• Est. Priority Date: 02/03/2014
• Status: Active Grant

• Current Assignee: Nike, Inc.
• Original Assignee: Nike, Inc.
• Inventors: Podhajny, Daniel A.
• Primary Examiner(s): Worrell, Danny
• Application Number:
  US14/271,547
• Time in Patent Office: 335 Days
• Field of Search: 661/69.R, 661/70, 661/71, 661/77, 661/78.R, 661/96, 662/02, 36/45, 36/47, 36/48, 36/49, 121/42.R, 121/46.R, 121/46.C, 121/42.P
• US Class Current: 66/177
• CPC Class Codes: A43B 1/04 braided, knotted, knitted or crocheted
• CPC Class Codes: A43B 23/042 Uppers made of one piece one piece slippers A43B3/106; one piece sandals A43B3/124
• CPC Class Codes: D04B 1/12 characterised by thread material
• CPC Class Codes: D04B 1/16 synthetic threads
• CPC Class Codes: D04B 1/24 wearing apparel
• CPC Class Codes: D10B 2401/041 thermoplastic; thermosetting
• CPC Class Codes: D10B 2403/021 Lofty fabric with equidistantly spaced front and back plies, e.g. spacer fabrics
• CPC Class Codes: D10B 2403/032 Flat fabric of variable width, e.g. including one or more fashioned panels
• CPC Class Codes: D10B 2501/043 Footwear

Abstract

An article of footwear including a full monofilament upper is described. The full monofilament upper incorporates a knitted component including a monofilament knit element. The monofilament knit element is formed by knitting with a monofilament strand. The monofilament knit element is formed of unitary knit construction with the remaining portions of the knitted component, including peripheral portions that are knit using a natural or synthetic twisted fiber yarn. An inlaid tensile element can extend through the knitted component, including portions of the monofilament knit element. The monofilament knit element may be knitted with a monofilament strand according to a variety of knit structures. A fusible strand may be knit with the monofilament knit element. Upon heating, the fusible strand can combine and surround the monofilament strand within the monofilament knit element.

Claims

1. An article of footwear having an upper and a sole structure secured to the upper, the upper including a knitted component comprising:

a monofilament knit element formed by at least one monofilament strand, the monofilament knit element forming a substantial majority of the upper and extending through at least a portion of each of a forefoot region, a midfoot region, and a heel region of the article of footwear; and

at least one course of the monofilament knit element including a fusible strand;

wherein the monofilament knit element forming the substantial majority of the upper is knitted exclusively using the at least one monofilament strand and the fusible strand, the at least one monofilament strand and the fusible strand having substantially similar diameters; and

wherein the fusible strand substantially covers the at least one monofilament strand upon heating the monofilament knit element to at least a glass transition temperature of the fusible strand.

2. The article of footwear according to claim 1, wherein the monofilament knit element comprises alternating courses including (1) the at least one monofilament strand and the fusible strand, and (2) the at least one monofilament strand without the fusible strand.

3. The article of footwear according to claim 1, wherein the at least one monofilament strand is made of a thermoset polymer material and the fusible strand is made of a thermoplastic polymer material.

4. The article of footwear according to claim 1, wherein the at least one monofilament strand consists of a single monofilament strand and the fusible strand consists of a single monofilament strand formed from thermoplastic polymer material.

5. The article of footwear according to claim 1, wherein a first monofilament strand of the at least one monofilament strand and the fusible strand are adjacent to each other and run together along a course of the monofilament knit element in an unheated configuration of the knitted component.

6. The article of footwear according to claim 5, wherein the first monofilament strand of the at least one monofilament strand and the fusible strand are at least partially combined together along a course of the monofilament knit element to form a combined strand in a heated configuration of the knitted component, the heated configuration being at least the glass transition temperature of the fusible strand.

7. The article of footwear according to claim 6, wherein the combined strand comprises an outer layer of the fusible strand surrounding a portion of the first monofilament strand.

8. The article of footwear according to claim 1, wherein the knitted component further comprises a peripheral portion formed by a first yarn, the first yarn being a natural or synthetic twisted fiber yarn;

wherein the monofilament knit element is formed of unitary knit construction with the peripheral portion of the knitted component such that the knitted component is a one-piece element.

9. The article of footwear according to claim 1, wherein the at least one monofilament strand and the fusible strand are formed of compatible materials.

10. The article of footwear according to claim 1, wherein the monofilament knit element defines substantially all of an exterior surface of the upper and an opposite interior surface of the upper, the interior surface defining a void for receiving a foot;

and

wherein the monofilament knit element extends (a) through each of a forefoot region, a midfoot region, and a heel region of the article of footwear, and (b) across a top of the upper between a medial side and a lateral side of the article of footwear.

11. A method of manufacturing an article of footwear having an upper and a sole structure secured to the upper, the upper including a knitted component, the method comprising:

knitting a monofilament knit element using at least one monofilament strand, the monofilament knit element forming a substantial majority of the upper and extending through at least a portion of each of a forefoot region, a midfoot region, and a heel region of the article of footwear; and

knitting at least one course of the monofilament knit element including a fusible strand with the at least one monofilament strand;

wherein the monofilament knit element forming the substantial majority of the upper is knitted exclusively using the at least one monofilament strand and the fusible strand, the at least one monofilament strand and the fusible strand having substantially similar diameters; and

wherein the fusible strand substantially covers the at least one monofilament strand upon heating the monofilament knit element to at least a glass transition temperature of the fusible strand.

12. The method according to claim 11, wherein the step of knitting the monofilament knit element further comprises:

knitting alternating courses including (1) the at least one monofilament strand and the fusible strand, and (2) the at least one monofilament strand without the fusible strand.

13. The method according to claim 11, wherein the at least one monofilament strand is made of a thermoset polymer material and the fusible strand is made of a thermoplastic polymer material.

14. The method according to claim 11, wherein the method is performing using a knitting machine;

and

wherein the step of knitting the at least one course of the monofilament knit element using the fusible strand further comprises;

knitting a course of the monofilament knit element using a first monofilament strand and the fusible strand that run together from a dispending tip of a feeder of the knitting machine.

15. The method according to claim 14, further comprising heating the knitted component including the fusible strand.

16. The method according to claim 15, wherein the step of heating the knitted component further comprises providing an amount of heat sufficient to reach the glass transition temperature of the fusible strand formed by a thermoplastic polymer material;

and

wherein the first monofilament strand of the at least one monofilament strand and the fusible strand are at least partially combined together along a course of the monofilament knit element to form a combined strand after the thermoplastic polymer material cools from the glass transition temperature of the fusible strand.

17. The method according to claim 16, wherein the combined strand comprises an outer layer of the fusible strand surrounding a portion of the first monofilament strand.

18. The method according to claim 11, wherein the method further comprises:

knitting a peripheral portion of the knitted component using a first yarn, the first yarn being a natural or synthetic twisted fiber yarn; and

knitting the monofilament knit element of unitary knit construction with the peripheral portion of the knitted component so as to form the knitted component as a one-piece element.

19. The method according to claim 11, wherein the method further comprises:

inlaying an inlaid tensile element within at least a portion of the monofilament knit element during the step of knitting the monofilament knit element.

20. The method according to claim 11, wherein the step of knitting the monofilament knit element further comprises:

knitting the monofilament knit element to form substantially all of an exterior surface of the upper and an opposite interior surface of the upper, the interior surface defining a void for receiving a foot; and

wherein the monofilament knit element extends (a) through each of a forefoot region, a midfoot region, and a heel region of the article of footwear, and (b) across a top of the upper between a medial side and a lateral side of the article of footwear.